Abrasive roller



P. BRAUNER AND E. METZN ER.

ABRASIVE ROLLER.

APPLICATION HLED FEB-l1, I920.

Patented Apr. 5, 1921.

INVENTOR5 oar FDNOUS .BBA'UNER AND EDWABD METZNER, OF NEW YORK, N. Y.

ABBASIVE ROLLER.

Specification of Letters Patent.

Patented Apr. 5, 11921.

Application filed February 11, 1920. serial .sto. 857,864.

To all whom it may concern:

Be it known that we, PINcUs BRAUNER and EDWARD METZNER, both citizens of the United States, and residents, respectively, of the count of the Bronx and the county of New Yor both in the city and State of New York, and whose post-ofiice addresses are No. 2284 Ryer avenue and No. 264 Riverside Drive, respectively, have invented a new and useful Improvement in Abrasive Rollers, of which the following is a specification.

The object of our invention is to provide improved means for fastenin terial on rollers, used for t e purpose of sand-papering various surfaces, as for instance the soles of shoes or breasts of heels.- These rollers are usually rotated automatically through conventional means, against the abrasively covered surface of WhlCh is,

Dressed the article desired to be so treated. The abrasive coverin will last effectively only for a limited time, and hence it becomes necessary, in the course of constant use, to remove and replace the worn out covering with new material. The difiicu lties encountered have been to so fasten the abrasive material as to present a clear and perfect workin surface around the entire circumference fro'nrone end of the roller to the other, regardless of the longitudinal ends of such material; and at the same time have the material fit in such a wa that it will be absolutely taut in hugging t e roller with no danger of loosenin at any time durin operation. It must e remembered that t e application of this abrasive covering must usually be accomplished on shafts that are fixed and supported from either one or both ends, making access not perfectly free and not always alike.

The distinct advantages of our im rov ed device lie in overcoming all thedi culties cited)" While we present means for fastening abrasive material on rollers in such a perfectly taut way as to prevent wrinkling and tearin and also premature wearing out, we accomp ish this with a minimum amount of material and with the use of a small amount of time.

The articular benefit of our device lies in the act that the tautness of the abrasive material about the roller is brought about distinctly in an automatic way, that is, with:

out resort to any independent. tightenin means. The very rotation of the roller wi tend to maintain such tautness,'wh1ch, 1n

- elements of rotation an abrasive mafact, becomes more pronounced with the pressure of any substancea ainst the abrasive material while the re er is rotating. In other words, in our device, the rotation and the pressure just mentioned are elements that hung about perfect tautness; while on the contrary, in existin devices these two tend to loosen the abrasive material simply because the locking means is brought about in an independent way, with no operative connection, as we have it, for the locking arrangement to maintain a secure position of said material without the aid of continual manual adjustment.

For a more particular description of our invention, reference is to be had to the accompanymfi drawings, forming a part hereof, in whic Figure 1, is a cushioned roller, in cross section, with abrasive material mounted thereon, and driven by a shaft supported from one end.

Fig. 2, is the same as Fig, 1, except that the cushioned roller has been slightly turned on the drive shaft by hand or other means.

Fig. 3, is a section of a cushioned ro ler,

crosswise, with abrasive material mounted thereon, and driven by a shaft supported and turned either from one or both ends.

Fig. 4, is the same as Fig. 3, except that the cushioned roller has been slightly turned on the drive shaft by handor other means.

Throughout the various views of the drawings, similar reference characters designate similar parts.

The numeral 1 designates a drive shaft sup orted and driven from one end. This shaft has a slightly flattened curve 2 so as to allow a space for the ends of the abrasive material 3'. The split hollow roller 4;, made preferably of slightly resilient material, fits curve 8 to admit the abrasive covering 3 and then jam it between said shaft and the split hollow roller 4. The roller 4 may be kept in place on the shaft by the friction between its interior surface and the exterior surface of the shaft; also by the abrasive material being jammed in between these two pressure positively surfaces; and in addition may be held in Operatc'On.

To place a new abrasive covering on a roller when shaft is supported at one end, and unattached at the other, as in Figs. 1 and 2, turn the roller 4 slightly in the same direction as rotation of shaft, and pull the sleeve or roller 4 off then cover this sleeve or roller with the abrasive material 3 pushing the endsthrough the split in the roller and bending the ends over slightly in the direction of rotation; then push on to shaft 1, longitudinally, keepingthe split'about midway of the flattened surface 2; then turn this sleeve or roller 4 in the opposite direction to the rotation of shaft 1, as shown in Fig. 2, until the loose ends of this abrasive material jam into the narrowing space between this flattened curved surface of shaft 1 and interior surface of sleeve or roller 4.

To place a new abrasive covering on roller when shaft is supported either at one or both ends, as in Figs. 8 and 4, turn the sleeve or split roller 4 slightly in the direction of rotation of shaft until the split in roller is.

over the groove or recess 7 in the shaft 6; then apply abrasive material around the roller, pushing loose ends of this material through split as shown in Fig. 3; then turn the sleeve or roller in the opposite direction to rotation of shaft 6 until the ends of the abrasive material jam into the narrowing space between the flattened surface 8 of shaft 6 and the interior surface of roller 4, as shown in Fig. 4. The method in Figs. 3 and 4 is singular, where the shaft is supported at both ends, and is alternate along with Figs. 1 andQ, where the shaft is supported.

onl at one end and free at the other.

t will be seen from the above that not only is the abrasive covering 3 made taut after application, but the jamming of its loose ends between either shaft shown and the interior of the roller 4 makes for aconstant pull in the direction of keeping said covering absolutely taut about the cush ioned material 5. This separate cushion is placed for more effective operation, but .it is not altogether indispensable, or it may be embodied in the abrasive material itself. It is also to be noted that the centrifugal force brought into play by the rotation of the to form a suitable space tautness. It will also be seen from the above that the rotation of the shaft 1 accomplishes not only the turning of the entire superimposed structure, but the same force tends to tighten and keep taut the abrasive material about said structure, as explained'before. Such tautness is further guarded or maintained bythe pressure of any substance for treatment on the abrasive material while said structure is rotating. This is due to the fact that the pressure, while normally helping to loosen the abrasive material, in our device it simply helps to feed such loosening to the continuous opposite pull of the shaft 1; so that instantly there is any give in such material, it is immediately snatched or taken up by the process of the loose ends of said material being further drawn in and jammed by the rotation of theshaft 1 as aforesaid. lVhat the pressure or any similar friction on the abrasive material brings about in the way of loosening, the rotation of the shaft 1 immediately disposes of in the way of tightening as aforesaid.

While we have shown and described one embodiment of our invention, it is obvious that it is not restricted thereto, but is broad enough to cover all structures that come within the scope of the annexed claims.

Having thus described our invention, what we claim is I 1. In a device of the class described, a shaft supported at one or both ends and adapted to be driven in either direction frictionally within the hollow portion of a suitable sleeve, said shaft being flattened at one side to form a suitable space between said side and the opposite wall of said sleeve and having a suitable recess adapted to be set in line with a corresponding cut insaid sleeve, abrasive material surrounding said sleeve and with the loose ends of such material normally commencing and terminating within said recess, said shaft being adapted to be so driven as to automatically jam said loose ends within said space and firmly move and constantly keep same so that said material shall be taut about said sleeve regardless of constant pressure or other friction on said material. I

2. In a device of the class described, a shaft supported at one end and adapted to be driven in either direction frictionally within the hollow portion of a sleeve slidand the opposite Wall of said sleeve, abrasive shall be taut about said sleeve regardless of material surrounding said sleeve and wlth constant pressure or other friction on said 10 the Zoose ends of such material normally material.

commencing and terminating Within said PINGUS BRAUNER. 5 space, said shaft 'being adapted to be so EDWARD METZNER.

driven as to automatically jam said loose Witnesses:

ends Within said space and firmly move and MINNIE LEDERER,

constantly keep same so that said material JACOB L. DIAMOND. 

